"Latency on the best VSAT is 600ms, which made Google DNS a bad choice. DNSBOX has made our internet service as fast as it can be." Mohammed Nori, MSTT, Libya
"ApplianSys maximizes ROI. We are fully satisfied with our CACHEBOX and DNSBOX solution" Kamal Essalai, CEO, West Africa Telecom (AirLink sarl), Liberia
"The management of DNS is very easy via the user friendly GUI. All you need is a basic knowledge of DNS and how it works" Moataz Sabri, Topnet Internet Services, Saudi Arabia
"The ApplianSys' DNSBOXes have been wonderful. I recommend them to everyone I know that has a DNS server." Matt Niswonger, Techician at UltraTech Resources, USA
"I was the only person who could make changes on our old DNS solution but now customers can manage their own DNS space." Paul Schuur, Senior Consultant, Qwise BV, Netherlands

Easy, Affordable Redundancy

Building redundancy into your DDI server architecture is critical to ensure your DDI services are highly available. How much redundancy is a question of risk, the business impact of any failure and available budget.

The DNSBOX range is designed and priced such that, for a given budget, you can build more redundancy into your architecture.

DNSBOX gives you redundancy in layers:

It makes the DNS master-slave approach easy and affordable

Its CompactFlash architecture gives you an extra layer of redundancy for free.

You can add extra servers for redundancy to your architecture, without adding high cost.

For added redundancy, DNSBOX masters can be deployed with a failover unit. This is deployed in a standby mode and configured to synchronise data from the active master. In the event of the active server failing, the failover is restarted in active mode and starts to respond to zone transfer requests and name queries.

When the original active machine becomes available again, it is placed in standby mode until the data has been fully synchronised back. Both machines are then restarted and their modes reversed.

In some scenarios, the normal DNS approach to redundancy, designed into BIND, won’t deliver the performance you need. So a single IP address must deliver 100% uptime. This demands high availability and rapid cutover in the event of a DNS server becoming unavailable.

DNSBOX achieves this by clustering two or more slaves. This combines failover and load-balancing functionality to give you a highly available, high performance DNS caching service. Unlike the standard approach, a DNSBOX cluster has a single IP address, so client configuration is simplified.

With just a few clicks DNSBOX’s user interface helps you configure failover pairs to deliver high availability DHCP.

In a DHCP failover deployment, multiple DNSBOXes are clustered to respond to DHCP requests. The load of requests is balanced between boxes and IP lease information is continuously synchronised across the cluster.

A regular exchange of status messages tells each DHCP server that other units in its cluster are operational. In the event that a DNSBOX fails to send its status message, the rest of the cluster will continue to manage the load whilst SNMP traps notify network administrators.

The DNSBOX authoritative slave has a useful redundancy feature engineered by ApplianSys.

Normal BIND behaviour is that when a slave zone expires, if the master is for some reason unavailable, the zone will no longer be served to clients.

Offline master mode avoids this problem:

DNSBOX takes zone backups regularly

If connectivity with the master is lost, you can enable Offline Master Mode

DNSBOX then assumes the role of a master, continuing to serve the zones from their last known ‘good’ state

This offline feature is also useful in planned instances of master-slave disconnection, such as during migration or before upgrades.

Because DNSBOX is versatile and scalable, our customers around the world come in all shapes and sizes. ISPs, enterprises, government agencies and even internet registers simplify, control and protect their DDI services with DNSBOX.

How can we make your visit easier?

Give us a few details about your requirement and we'll make your life easier by serving the most relevant information.